When it comes to describing something that is hard to understand, there are several synonyms that can be used to give a better and more precise description of the situation. Some examples of these words include complex, complicated, obscure, enigmatic, inscrutable, perplexing, intricate, convoluted, and abstruse. While these words all convey the same general meaning, they each have their own nuances that can help to more accurately describe the level of difficulty in understanding something. By using these synonyms for "difficult to understand," individuals can better convey the level of challenge in comprehending a particular concept or topic.